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Track the adoption of Swift 6 strict concurrency checks for data race safety. How many packages are Ready for Swift 6?

Build Information

Successful build of AirbnbSwift, reference master (ea5b44), with Swift 6.1 for macOS (SPM) on 2 May 2025 01:38:36 UTC.

Swift 6 data race errors: 2

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures

Build Log

========================================
RunAll
========================================
Builder version: 4.61.3
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/airbnb/swift.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/airbnb/swift
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at ea5b449 Remove unusedPrivateDeclarations rule (#304)
Cloned https://github.com/airbnb/swift.git
Revision (git rev-parse @):
ea5b4491624882b35f9bb6352b35e57217f48136
SUCCESS checkout https://github.com/airbnb/swift.git at master
Fetching https://github.com/apple/swift-argument-parser from cache
Fetched https://github.com/apple/swift-argument-parser from cache (0.69s)
Computing version for https://github.com/apple/swift-argument-parser
Computed https://github.com/apple/swift-argument-parser at 1.0.3 (1.34s)
Creating working copy for https://github.com/apple/swift-argument-parser
Working copy of https://github.com/apple/swift-argument-parser resolved at 1.0.3
Downloading binary artifact https://github.com/calda/SwiftFormat/releases/download/0.56-beta-9/SwiftFormat.artifactbundle.zip
Downloading binary artifact https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip
[16375/11034045] Downloading https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip
[11066795/56437733] Downloading https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip, https://github.com/calda/SwiftFormat/releases/download/0.56-beta-9/SwiftFormat.artifactbundle.zip
Downloaded https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip (1.49s)
Downloaded https://github.com/calda/SwiftFormat/releases/download/0.56-beta-9/SwiftFormat.artifactbundle.zip (2.99s)
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "swift",
      "name": "AirbnbSwift",
      "url": "https://github.com/airbnb/swift.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift",
      "dependencies": [
        {
          "identity": "swift-argument-parser",
          "name": "swift-argument-parser",
          "url": "https://github.com/apple/swift-argument-parser",
          "version": "1.5.0",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-argument-parser",
          "dependencies": [
          ]
        }
      ]
    }
  ]
}
Fetching https://github.com/airbnb/swift.git
[1/4083] Fetching swift
Fetched https://github.com/airbnb/swift.git from cache (2.42s)
Fetching https://github.com/apple/swift-argument-parser from cache
Fetched https://github.com/apple/swift-argument-parser from cache (0.54s)
Computing version for https://github.com/apple/swift-argument-parser
Computed https://github.com/apple/swift-argument-parser at 1.5.0 (1.09s)
Creating working copy for https://github.com/apple/swift-argument-parser
Working copy of https://github.com/apple/swift-argument-parser resolved at 1.5.0
Creating working copy for https://github.com/airbnb/swift.git
Working copy of https://github.com/airbnb/swift.git resolved at master (ea5b449)
Fetching binary artifact https://github.com/calda/SwiftFormat/releases/download/0.56-beta-9/SwiftFormat.artifactbundle.zip from cache
Fetching binary artifact https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip from cache
Fetched https://github.com/realm/SwiftLint/releases/download/0.55.1/SwiftLintBinary-macos.artifactbundle.zip from cache (1.15s)
Fetched https://github.com/calda/SwiftFormat/releases/download/0.56-beta-9/SwiftFormat.artifactbundle.zip from cache (1.89s)
Found 1 product dependencies
  - swift-argument-parser
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/airbnb/swift.git
https://github.com/airbnb/swift.git
{
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    {
      "identity" : "swift-argument-parser",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.3",
            "upper_bound" : "2.0.0"
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      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-argument-parser"
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        "AirbnbSwiftFormatTool"
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  ],
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      "name" : "SwiftLintBinary",
      "path" : "remote/archive/SwiftLintBinary-macos.artifactbundle.zip",
      "product_memberships" : [
        "FormatSwift"
      ],
      "sources" : [
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      "type" : "binary"
    },
    {
      "c99name" : "FormatSwift",
      "module_type" : "PluginTarget",
      "name" : "FormatSwift",
      "path" : "Plugins/FormatSwift",
      "plugin_capability" : {
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          "description" : "Formats Swift source files according to the Airbnb Swift Style Guide",
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          {
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        "type" : "command"
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      "product_memberships" : [
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        "Plugin.swift"
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      "target_dependencies" : [
        "AirbnbSwiftFormatTool",
        "swiftformat",
        "SwiftLintBinary"
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      "type" : "plugin"
    },
    {
      "c99name" : "AirbnbSwiftFormatToolTests",
      "module_type" : "SwiftTarget",
      "name" : "AirbnbSwiftFormatToolTests",
      "path" : "Tests/AirbnbSwiftFormatToolTests",
      "sources" : [
        "AirbnbSwiftFormatToolTests.swift"
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      "target_dependencies" : [
        "AirbnbSwiftFormatTool"
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      "type" : "test"
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        "AirbnbSwiftFormatTool"
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        "AirbnbSwiftFormatTool.swift",
        "Command.swift"
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Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
[1/1] Compiling plugin FormatSwift
Building for debugging...
[1/20] Write sources
[5/20] Copying swiftlint.yml
[7/20] Write sources
[9/20] Copying airbnb.swiftformat
[11/20] Write AirbnbSwiftFormatTool-tool-entitlement.plist
[11/20] Write AirbnbSwiftFormatTool-entitlement.plist
[13/20] Write swift-version-2F0A5646E1D333AE.txt
[15/24] Compiling ArgumentParserToolInfo ToolInfo.swift
[16/24] Emitting module ArgumentParserToolInfo
[17/24] Compiling ArgumentParserToolInfo ToolInfo.swift
[18/24] Emitting module ArgumentParserToolInfo
[19/94] Emitting module ArgumentParser
[21/100] Compiling ArgumentParser Parsed.swift
[22/100] Compiling ArgumentParser ParsedValues.swift
[23/100] Compiling ArgumentParser ParserError.swift
[24/100] Compiling ArgumentParser SplitArguments.swift
[25/100] Compiling ArgumentParser SequenceExtensions.swift
[26/100] Compiling ArgumentParser StringExtensions.swift
[27/100] Compiling ArgumentParser Tree.swift
[28/100] Compiling ArgumentParser Argument.swift
[29/100] Compiling ArgumentParser ArgumentHelp.swift
[30/100] Compiling ArgumentParser CompletionKind.swift
[31/100] Compiling ArgumentParser Errors.swift
[36/100] Compiling ArgumentParser Flag.swift
[37/100] Compiling ArgumentParser NameSpecification.swift
[38/100] Compiling ArgumentParser Option.swift
[39/100] Compiling ArgumentParser OptionGroup.swift
[40/100] Compiling ArgumentParser CommandConfiguration.swift
[41/100] Compiling ArgumentParser EnumerableFlag.swift
[42/100] Compiling ArgumentParser ExpressibleByArgument.swift
[43/100] Compiling ArgumentParser ParsableArguments.swift
[52/100] Compiling ArgumentParser BashCompletionsGenerator.swift
[53/100] Compiling ArgumentParser CompletionsGenerator.swift
[54/100] Compiling ArgumentParser FishCompletionsGenerator.swift
[55/100] Compiling ArgumentParser ZshCompletionsGenerator.swift
[63/100] Compiling ArgumentParser ParsableArgumentsValidation.swift
[64/100] Compiling ArgumentParser ParsableCommand.swift
[65/100] Compiling ArgumentParser ArgumentDecoder.swift
[66/100] Compiling ArgumentParser ArgumentDefinition.swift
[67/100] Compiling ArgumentParser CollectionExtensions.swift
[68/100] Compiling ArgumentParser ArgumentSet.swift
[69/100] Compiling ArgumentParser CommandParser.swift
[70/100] Compiling ArgumentParser InputOrigin.swift
[71/100] Compiling ArgumentParser Name.swift
[72/100] Compiling ArgumentParser DumpHelpGenerator.swift
[73/100] Compiling ArgumentParser HelpCommand.swift
[74/100] Compiling ArgumentParser HelpGenerator.swift
[80/100] Compiling ArgumentParser MessageInfo.swift
[81/100] Compiling ArgumentParser UsageGenerator.swift
[95/108] Compiling AirbnbSwiftFormatTool resource_bundle_accessor.swift
[96/108] Compiling AirbnbSwiftFormatTool Command.swift
/Users/admin/builder/spi-builder-workspace/Sources/AirbnbSwiftFormatTool/Command.swift:12:14: warning: static property 'runCommand' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
10 |
11 |   /// This property can be overridden to provide a mock implementation in unit tests.
12 |   static var runCommand: (Command) throws -> Int32 = { try $0.executeShellCommand() }
   |              |- warning: static property 'runCommand' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: convert 'runCommand' to a 'let' constant to make 'Sendable' shared state immutable
   |              |- note: add '@MainActor' to make static property 'runCommand' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
13 |
14 |   let log: Bool
[97/108] Emitting module AirbnbSwiftFormatTool
/Users/admin/builder/spi-builder-workspace/Sources/AirbnbSwiftFormatTool/Command.swift:12:14: warning: static property 'runCommand' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
10 |
11 |   /// This property can be overridden to provide a mock implementation in unit tests.
12 |   static var runCommand: (Command) throws -> Int32 = { try $0.executeShellCommand() }
   |              |- warning: static property 'runCommand' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: convert 'runCommand' to a 'let' constant to make 'Sendable' shared state immutable
   |              |- note: add '@MainActor' to make static property 'runCommand' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
13 |
14 |   let log: Bool
[98/108] Compiling AirbnbSwiftFormatTool AirbnbSwiftFormatTool.swift
[99/108] Emitting module AirbnbSwiftFormatTool
/Users/admin/builder/spi-builder-workspace/Sources/AirbnbSwiftFormatTool/Command.swift:12:14: warning: static property 'runCommand' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
10 |
11 |   /// This property can be overridden to provide a mock implementation in unit tests.
12 |   static var runCommand: (Command) throws -> Int32 = { try $0.executeShellCommand() }
   |              |- warning: static property 'runCommand' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: convert 'runCommand' to a 'let' constant to make 'Sendable' shared state immutable
   |              |- note: add '@MainActor' to make static property 'runCommand' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
13 |
14 |   let log: Bool
[99/108] Write Objects.LinkFileList
[101/108] Compiling AirbnbSwiftFormatTool Command.swift
/Users/admin/builder/spi-builder-workspace/Sources/AirbnbSwiftFormatTool/Command.swift:12:14: warning: static property 'runCommand' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
10 |
11 |   /// This property can be overridden to provide a mock implementation in unit tests.
12 |   static var runCommand: (Command) throws -> Int32 = { try $0.executeShellCommand() }
   |              |- warning: static property 'runCommand' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |              |- note: convert 'runCommand' to a 'let' constant to make 'Sendable' shared state immutable
   |              |- note: add '@MainActor' to make static property 'runCommand' part of global actor 'MainActor'
   |              `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
13 |
14 |   let log: Bool
[102/108] Compiling AirbnbSwiftFormatTool AirbnbSwiftFormatTool.swift
[103/108] Compiling AirbnbSwiftFormatTool resource_bundle_accessor.swift
[103/108] Write Objects.LinkFileList
[104/108] Linking AirbnbSwiftFormatTool
[105/108] Applying AirbnbSwiftFormatTool
[106/108] Linking AirbnbSwiftFormatTool-tool
[107/108] Applying AirbnbSwiftFormatTool-tool
Build complete! (8.86s)
Build complete.
{
  "dependencies" : [
    {
      "identity" : "swift-argument-parser",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.3",
            "upper_bound" : "2.0.0"
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Done.